Refrigerating apparatus



O. M. SUMMERS- REFRIGERATING'"APPARATUS Dec. l, 1931.

Filed May 28, 1930 you.

ma... ai al muv I IQVENTO ,Mw w@ M TTORNEY Patented Decil, 193i UNITED STATES lrATENi OFFICE omo x. s, or nAir'roN', omo, AssxGNon. 'ro FRIGIDAIRE cononArIoN, or

y nAY'roN, omo, A conronA'rioN or DELAWARE f l' maionnurme ArrAaA'rUs Application led lay 88,

Thisinvention relates evaporators for -refrigerating apparatus and" more particu- .larly to 'the' re' present invention will be apparent from the following description, reference being had to the accompanyingfdrawings, wherein a preferred form of the present invention is 4clearv ly shown.

In the drawings:

Fig. 1 is a view illustrating diagrammaticallya refrigerating system including the evaporator, on a larger scale, embodying features of the present invention, said evaporator being shown in cross section, and Fig. 2 is a fragmentary view of a portion of the evaporator shown in Fi 1, the view be- A'in taken in the direction of t e arrows 2--2- eferrin to the drawings,.the numeral 20 f designates in general an evaporator, comprisin a header or container 21 forming a reservoir for liquid refrigerant, such as. sulphur dioxide, and from whichl header de nds a plurality of refrigerant conveyin ucts 22 or conveying the refri rant to t e zone or lace to be refrigeratea Refrigerant is deivered to the header throu li refrigerant conveying pipe 24 and is with rawn through a vapor pipe`25. The pipe 24 is connected with a receiver 27 and the ipe 25 is` connected to the low pressure ei e of a compressor 30, preferably as shown to the crank case thereofc The high pressure side of the com.-

presser is connected with a condenser '31 which in turn is connected witlithe receiver 27. The compreor is herein showny as D" driven by a motor 3% which is vcontrolled in isso. -seriai No. maza',

by means of an automatic switch 34 which connects the'motor with the power mains 35. The header 21 which is herein shown as a refrigerant containing chamber is formed of response to the pressure within the pipe -25 a drawn sheet metal tube having one end thereof open which receives a ring 4() which is suitably sealed in position. A head or valve plate 42 is secured to the ring 40 by screws 43 and carries shut off valves 44 and 45 which are connected respectively with pipes 24 and 25. The head 42 'is ,provided kwith an opening 47 communicating with the valve 45 and carries an inwardly extending and upwardly sloping tube 48 for conve ing p gaseous refrigerant from the free space a ovc the liquid. in the refrigerating l chamber.

The'head 42 is also provided with a ,cylin-` ,l

dric'ally shaped inwardly extending boss 50 having, a screened opening 5I which com.-

municates with the valve 44. The size of the opening 51 is reduced to.A a small oricen53 which provides a seat for a needlenva-lve 55. A sleeve 58 is secured to the b oss 50 and is provided with an inwardly extendin ledge or support 60 for su orting a iioat 61v and a iioat 62. cated at 65 to receive a portion of an actuator ,or lever 68 which actuates the valve 55 the valve being pivotally connected to the ever at 69. The lever 68 ispivotally mounted be.

tween the forks of the support 60 b means of a pin carried by the lever. 'A he in 70 extends through 'the support 60 to t us provide a`pivotal mounting 72 for the fioat' bracket 61 on opposite sides'of said support.

racket e supportV 60 is bifur Thus it will be noted that the pin 70 provides v a ivotal mountin va ve and a pivotalg 61 which pivotally connects the iioat with the support. V v

Means is provided for yieldin ly' maintaining the iioat in a predetermined position with respect to `the` valve actuator during nornial operation of the float. Thus the spring may be provided, which 4spring; may be, for instance, a helical' springc The. spring 80 may have one end connected to the lever 68 and the other end .to al flange 82 which forms apart of the bracket 6i;

for the actuator for the mounting for the bracket Means is provided for adjustably main- I taining said loatin a predetermined position with respect to the actuator during normal operation of the ioat.. As shown in `the drawings ascre'w 84 may be threaded into a iange 85 orming'a partcf the bracket 61. Thus it will be noted that the screw 84 en ages the lever 68, and that 'said screw may e turned to vary the posltlon of the loat with respect to the lever 68. By varyl ing the position of the float with respect to the lever 68, the loperation of the valve will be varied, as is well understood to those skilled in the art.

Itwill be apparent from the foregoing that the evapov the ow of refrigerant through rater will be controlled by the needle valve 55 which controls the flow -of refrigerant from receiver 31 and this flow isresponsive to the loat62 so-that when a predetermined quantity of refrigerant is contained in the chamber 21, the ioat will close or tend to close the needle valve and thus stop or impede the flow of refrigerant to the evaporator. For the purpose of illustration I have shown the refrigerant level at 86 and an oillevel at 87.

The operation of the ioat mechanism is as follows. .As the refrigerant in the chamber increases, the iioat will move u wardly and by means of the spring 80 said oat will actuate the lever 68 which in turn tends to close the valve. As the refrigerant in the chamber 21 decreases, the float will move downwardly and by means of the screw 84 said float will actuate the lever which in turn tends to open the valve. In order to prevent the valve 55 from being removed too far from its seat, the valve actuator 68 is pro.

vided with a stop 90A which engages the support when the actuator reaches a predetermined position. v

In the event the mechanism including the ioat is subjected to vabnormal conditions, such as severe shocks, as for instance, such shocks as may occur during transportation of the evaporator, the float 62 would be jarred upwardly very quickly and if it were not for the yieldable spring 80 said float would jam the needle valve 55 into its seat and thereby damage said valve or its seat, or both. Thus,

when" this .abnormal condition occurs, the

nsaaoea ferr-ed form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

What is claimed is as follows:

1. In an evaporator for a refrigerating apparatus, the combination with a valve, of an actuator for said valve, a float, and connecting means for yieldingly maintaining said float in a predetermined position with respect'to aid actuator during normal operation of said oat 2. In an evaporator or a refrigerating apparatus, the combination with a valve, of an actuator 'for said valve, a iioat, andconnecting means for resiliently maintaining said ioat in a predetermined position with respect to said actuator during normal operatin of said iloat.

3. In an evaporator for a refrigerating ap, paratus, the combination with a container having a restricted passage, of a valve for controlling said passage, a lever for actuating said valve, a ioat, and connecting means for yieldingly maintaining said float in a predetermined position with respect to said lever during normal operation of said liioat, said means being adapted to yield during movement of the float in a predetermined direction 'iin the event of abnormal operation of said oat.

4. In an evaporator for a refrigerating appara-tus, the combination with a valve, of an actuator for said valve, a float, and connecting means for .adjustably maintaining said float 1n a predetermined position with respect to iaid actuator during normal operation of said oat.

In testimony whereof I hereto atlix my signaturen CTT() M. SUMMERS. 

